SU1521529A1 - Cutting tool tooth - Google Patents

Abstract

The invention relates to metal working and can be used in the manufacture of cutting tools, such as carbide multi-faceted plates. The purpose of the invention is to increase tool life by ensuring uniform wear on the back surface. The intersection of the front and main surfaces is the main cutting blade, the front and auxiliary rear surfaces — the auxiliary blade, the front and radius edges — the radius cutting blade, and the front and radius edges — the radius cutting blade. The tooth has a main hind angle, auxiliary hind angles and auxiliary angles in plan. The back angle on the radius conjugation, measured in section, the position of which is determined by the angle between the tangent to the radius blade at the measuring point of the rear angle and the longitudinal axis of the tooth, is determined from the relation Α @ = Α ₁ + (-Α ₁ ) (ϕ / 90 °) ^B , where α @ is the back angle on radius conjugation, degrees.

α ₁ - auxiliary rear angle, hail.

α - the main rear angle, degrees.

ϕ - the angle between the tangent to the radius blade at the point of measuring the angle ϕ and the longitudinal axis of the tooth, deg.

B is an exponent, the value of which varies between 0.5-0.8. 2 Il.

Description

The invention relates to metal working and can be used in the manufacture of cutting tools, such as carbide multi-faceted plates.

The purpose of the invention is to increase tool life by ensuring uniform wear on the rear surfaces.

FIG. depicts a cutting tool tooth, isometric; in fig. 2 is a view A of FIG. one.

The tooth of the cutting tool has a front surface 1, a main 2 and two auxiliary 3 rear surfaces, as well as radius joints of the 4 main 2 and auxiliary 3 rear surfaces. The intersection of the front 1 and the main rear 2 surfaces is the main cutting blade 5, the front 1 and the secondary rear 3 surfaces - the secondary blade 6, the front and radius mating 4 - the radius cutting blade 7 ..

The tooth has a main posterior angle cx, auxiliary posterior angles a and auxiliary angles in terms of q.

The posterior angle a on the radius conjugation, measured in cross section, the position of which is determined by the angle cf between the tangent to the radius blade at the measuring point of the angle h and the longitudinal axis of the tooth, is determined by

from the ratio:

oc, | cti + (a -ai)

-

90 °

radius

sopr where o., is the back angle on the helix;

auxiliary rear angle, hail; main rear angle, hail; angle. between the tangent to the radius blade at the point of measurement of the angle a, | and the longitudinal axis of the tooth, hail; exponent, the value of which varies in the limit. x 0.5-0.8.

ai - a - (

SP

1C ate

YU

with

The sharpening of the back radius of the tooth is carried out on CNC grinding machines or on universal grinding machines using a special copier, which provides the profile of the back radius surface in accordance with the indicated dependence.

The proposed tooth of the cutting tool may be the cutting part of a groove cutter, a disk cutter, and carbide multi-faceted plates designed to equip the assembled groove cutters and disk cutters.

The thickness of the slice on the radius cutting blade varies from zero (at the transition point to the secondary cutting blade) to the maximum value (at the transition point to the main cutting blade). Changing the thickness of the slice leads to a change in the loading conditions of the radius cutting blade.

To ensure maximum durability of the cutting tool, wear on the back surface should be minimal and uniform throughout the entire cutting blade.

The values of the main rear angle a and the auxiliary rear angle ai are chosen optimal for a particular tool pair - the material to be processed and the groove widths.

The value of the exponent, 5-0.8, is found experimentally and is optimal.

0

five

0

five

Claims (1)

Invention Formula A cutting tool tooth having a front surface, rear main and two auxiliary surfaces radially conjugated with a main rear surface, the intersections of which form the main, respectively, two auxiliary and two radius cutting blades with a main back angle, large auxiliary back corners, differing from that, in order to increase durability by ensuring uniform wear on the back surface (s), the back angle on radius joints has values determined from the ratio a.at + (a - oci) (QQO). where a ,, is the back angle on radius interfaces, hail; 0.1 - auxiliary clearance angle, hail; a - main rear angle, hail; q - the angle between the longitudinal section of the tooth and the tangent to the radius cutting blade, hail; , 5-0.8 is an exponent. 1 FIG. 2